CVE-2026-31472xfrm: iptfs: validate inner IPv4 header length in IPTFS payload

Official description

In the Linux kernel, the following vulnerability has been resolved: xfrm: iptfs: validate inner IPv4 header length in IPTFS payload Add validation of the inner IPv4 packet tot_len and ihl fields parsed from decrypted IPTFS payloads in __input_process_payload(). A crafted ESP packet containing an inner IPv4 header with tot_len=0 causes an infinite loop: iplen=0 leads to capturelen=min(0, remaining)=0, so the data offset never advances and the while(data < tail) loop never terminates, spinning forever in softirq context. Reject inner IPv4 packets where tot_len < ihl*4 or ihl*4 < sizeof(struct iphdr), which catches both the tot_len=0 case and malformed ihl values. The normal IP stack performs this validation in ip_rcv_core(), but IPTFS extracts and processes inner packets before they reach that layer.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/de6d8e8ce5187f7402c9859b443355e7120c5f09
• https://git.kernel.org/stable/c/3db7d4f777a00164582061ccaa99569cd85011a3
• https://git.kernel.org/stable/c/0d10393d5eac33cbd92f7a41fddca12c41d3cb7e